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SAE-AISI 9255 Steel vs. R30006 Cobalt

SAE-AISI 9255 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 21
1.0
Fatigue Strength, MPa 270
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
85
Tensile Strength: Ultimate (UTS), MPa 680
900
Tensile Strength: Yield (Proof), MPa 390
540

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 1.5
7.8
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 46
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 400
670
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
29
Strength to Weight: Bending, points 22
24
Thermal Diffusivity, mm2/s 13
3.9
Thermal Shock Resistance, points 21
26

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.9 to 1.4
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 96.2 to 97
0 to 3.0
Manganese (Mn), % 0.7 to 1.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.8 to 2.2
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
4.0 to 6.0